#!/bin/bash

PATCH_DIR="$(dirname ${BASH_SOURCE[0]})"

function bazel_patch()
{
  [ ! -d "${PATCH_DIR}/patch/bazel/${BAZEL_VERSION}" ] && return 0
  for f in $(find "${PATCH_DIR}/patch/bazel/${BAZEL_VERSION}" -type f | sort); do
    patch -p1 < "$f" || return 1
  done
  return 0
}

function tf_patch()
{
  [ ! -d "${PATCH_DIR}/patch/tensorflow/${TF_VERSION}" ] && return 0
  for f in $(find "${PATCH_DIR}/patch/tensorflow/${TF_VERSION}" -type f | sort); do
    git apply "$f" || return 1
  done
  return 0
}

function tf_toolchain_patch()
{
  local CROSSTOOL_NAME="$1"
  local CROSSTOOL_DIR="$2"
  local CROSSTOOL_EXTRA_INCLUDE="$3"
  [ -z "$CROSSTOOL_EXTRA_INCLUDE" ] && CROSSTOOL_EXTRA_INCLUDE="/usr/local/include/"
  local CROSSTOOL_VERSION=$($CROSSTOOL_DIR/bin/$CROSSTOOL_NAME-gcc -dumpversion)
  git apply << EOF
diff --git a/BUILD.local_arm_compiler b/BUILD.local_arm_compiler
new file mode 100644
index 000000000..e5d8cc384
+++ b/BUILD.local_arm_compiler
@@ -0,0 +1,81 @@
+package(default_visibility = ['//visibility:public'])
+
+filegroup(
+  name = 'gcc',
+  srcs = [
+    'bin/$CROSSTOOL_NAME-gcc',
+  ],
+)
+
+filegroup(
+  name = 'ar',
+  srcs = [
+    'bin/$CROSSTOOL_NAME-ar',
+  ],
+)
+
+filegroup(
+  name = 'ld',
+  srcs = [
+    'bin/$CROSSTOOL_NAME-ld',
+  ],
+)
+
+filegroup(
+  name = 'nm',
+  srcs = [
+    'bin/$CROSSTOOL_NAME-nm',
+  ],
+)
+
+filegroup(
+  name = 'objcopy',
+  srcs = [
+    'bin/$CROSSTOOL_NAME-objcopy',
+  ],
+)
+
+filegroup(
+  name = 'objdump',
+  srcs = [
+    'bin/$CROSSTOOL_NAME-objdump',
+  ],
+)
+
+filegroup(
+  name = 'strip',
+  srcs = [
+    'bin/$CROSSTOOL_NAME-strip',
+  ],
+)
+
+filegroup(
+  name = 'as',
+  srcs = [
+    'bin/$CROSSTOOL_NAME-as',
+  ],
+)
+
+filegroup(
+  name = 'compiler_pieces',
+  srcs = glob([
+    '$CROSSTOOL_NAME/**',
+    'libexec/**',
+    'lib/gcc/$CROSSTOOL_NAME/**',
+    'include/**',
+  ]),
+)
+
+filegroup(
+  name = 'compiler_components',
+  srcs = [
+    ':gcc',
+    ':ar',
+    ':ld',
+    ':nm',
+    ':objcopy',
+    ':objdump',
+    ':strip',
+    ':as',
+  ],
+)
diff --git a/WORKSPACE b/WORKSPACE
index 74ea14d0fd..7921284123 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -18,6 +18,12 @@ load("//tensorflow:workspace.bzl", "tf_repositories")
 # Please add all new TensorFlow dependencies in workspace.bzl.
 tf_repositories()

+new_local_repository(
+    name = "local_arm_compiler",
+    path = "$CROSSTOOL_DIR",
+    build_file = "BUILD.local_arm_compiler",
+)
+
 load("@io_bazel_rules_closure//closure:defs.bzl", "closure_repositories")

 closure_repositories()
diff --git a/tools/local_arm_compiler/BUILD b/tools/local_arm_compiler/BUILD
new file mode 100644
index 000000000..ccddd6d50
+++ b/tools/local_arm_compiler/BUILD
@@ -0,0 +1,50 @@
+package(default_visibility = ["//visibility:public"])
+
+cc_toolchain_suite(
+  name = 'toolchain',
+  toolchains = {
+    'armeabi|compiler':':cc-compiler-armeabi',
+    "local|compiler": ":cc-compiler-local",
+    "armeabi": ":cc-compiler-armeabi",
+    "k8": ":cc-compiler-local",
+    "piii": ":cc-compiler-local",
+    "arm": ":cc-compiler-local",
+    "s390x": ":cc-compiler-local",
+  },
+)
+
+filegroup(
+    name = "empty",
+    srcs = [],
+)
+
+filegroup(
+  name = 'linaro_linux_all_files',
+  srcs = [
+    '@local_arm_compiler//:compiler_pieces',
+  ],
+)
+
+cc_toolchain(
+    name = "cc-compiler-local",
+    all_files = ":empty",
+    compiler_files = ":empty",
+    cpu = "local",
+    dwp_files = ":empty",
+    linker_files = ":empty",
+    objcopy_files = ":empty",
+    strip_files = ":empty",
+    supports_param_files = 1,
+    toolchain_identifier = "local_linux",
+)
+cc_toolchain(
+  name = 'cc-compiler-armeabi',
+  all_files = ':linaro_linux_all_files',
+  compiler_files = ':linaro_linux_all_files',
+  cpu = 'armeabi',
+  dwp_files = ':empty',
+  linker_files = ':linaro_linux_all_files',
+  objcopy_files = 'linaro_linux_all_files',
+  strip_files = 'linaro_linux_all_files',
+  supports_param_files = 1,
+  toolchain_identifier = "$CROSSTOOL_NAME",)
diff --git a/tools/local_arm_compiler/CROSSTOOL b/tools/local_arm_compiler/CROSSTOOL
new file mode 100644
index 000000000..3ff006da8
+++ b/tools/local_arm_compiler/CROSSTOOL
@@ -0,0 +1,862 @@
+major_version: "local"
+minor_version: ""
+default_target_cpu: "same_as_host"
+
+
+
+
+
+
+
+
+
+default_toolchain {
+  cpu: "darwin"
+  toolchain_identifier: "local_darwin"
+}
+default_toolchain {
+  cpu: "freebsd"
+  toolchain_identifier: "local_freebsd"
+}
+default_toolchain {
+  cpu: "armeabi"
+  toolchain_identifier: "$CROSSTOOL_NAME"
+}
+default_toolchain {
+  cpu: "arm"
+  toolchain_identifier: "local_linux"
+}
+default_toolchain {
+  cpu: "x64_windows"
+  toolchain_identifier: "local_windows_msys64"
+}
+default_toolchain {
+  cpu: "x64_windows_msvc"
+  toolchain_identifier: "vc_14_0_x64"
+}
+default_toolchain {
+  cpu: "s390x"
+  toolchain_identifier: "local_linux"
+}
+
+toolchain {
+  abi_version: "armeabi"
+  abi_libc_version: "armeabi"
+  builtin_sysroot: ""
+  compiler: "compiler"
+  host_system_name: "armeabi"
+  needsPic: true
+  supports_gold_linker: false
+  supports_incremental_linker: false
+  supports_fission: false
+  supports_interface_shared_objects: false
+  supports_normalizing_ar: false
+  supports_start_end_lib: false
+  target_libc: "armeabi"
+  target_cpu: "armeabi"
+  target_system_name: "armeabi"
+  toolchain_identifier: "$CROSSTOOL_NAME"
+  tool_path { name: "ar" path: "$CROSSTOOL_DIR/bin/$CROSSTOOL_NAME-ar" }
+  tool_path { name: "compat-ld" path: "/bin/false" }
+  tool_path { name: "cpp" path: "$CROSSTOOL_DIR/bin/$CROSSTOOL_NAME-cpp" }
+  tool_path { name: "dwp" path: "$CROSSTOOL_DIR/bin/$CROSSTOOL_NAME-dwp" }
+  tool_path { name: "gcc" path: "$CROSSTOOL_DIR/bin/$CROSSTOOL_NAME-gcc" }
+  tool_path { name: "gcov" path: "$CROSSTOOL_DIR/bin/$CROSSTOOL_NAME-gcov" }
+  tool_path { name: "ld" path: "$CROSSTOOL_DIR/bin/$CROSSTOOL_NAME-ld" }
+  tool_path { name: "nm" path: "$CROSSTOOL_DIR/bin/$CROSSTOOL_NAME-nm" }
+  tool_path { name: "objcopy" path: "$CROSSTOOL_DIR/bin/$CROSSTOOL_NAME-objcopy" }
+  tool_path { name: "objdump" path: "$CROSSTOOL_DIR/bin/$CROSSTOOL_NAME-objdump" }
+  tool_path { name: "strip" path: "$CROSSTOOL_DIR/bin/$CROSSTOOL_NAME-strip" }
+
+  cxx_builtin_include_directory: "$CROSSTOOL_DIR/$CROSSTOOL_NAME/include/c++/$CROSSTOOL_VERSION/"
+  cxx_builtin_include_directory: "$CROSSTOOL_DIR/$CROSSTOOL_NAME/sysroot/usr/include/"
+  cxx_builtin_include_directory: "$CROSSTOOL_DIR/$CROSSTOOL_NAME/libc/usr/include/"
+  cxx_builtin_include_directory: "$CROSSTOOL_DIR/lib/gcc/$CROSSTOOL_NAME/$CROSSTOOL_VERSION/include"
+  cxx_builtin_include_directory: "$CROSSTOOL_DIR/lib/gcc/$CROSSTOOL_NAME/$CROSSTOOL_VERSION/include-fixed"
+  cxx_builtin_include_directory: "/usr/include"
+  cxx_builtin_include_directory: "/usr/include/$CROSSTOOL_NAME"
+  cxx_builtin_include_directory: "$CROSSTOOL_EXTRA_INCLUDE"
+
+  cxx_flag: "-std=c++11"
+  cxx_flag: "-isystem"
+  cxx_flag: "/usr/include"
+  cxx_flag: "-isystem"
+  cxx_flag: "/usr/include/$CROSSTOOL_NAME"
+  linker_flag: "-lstdc++"
+
+  unfiltered_cxx_flag: "-Wno-builtin-macro-redefined"
+  unfiltered_cxx_flag: "-D__DATE__=\"redacted\""
+  unfiltered_cxx_flag: "-D__TIMESTAMP__=\"redacted\""
+  unfiltered_cxx_flag: "-D__TIME__=\"redacted\""
+
+  unfiltered_cxx_flag: "-no-canonical-prefixes"
+  unfiltered_cxx_flag: "-fno-canonical-system-headers"
+
+  compiler_flag: "-U_FORTIFY_SOURCE"
+  compiler_flag: "-D_FORTIFY_SOURCE=1"
+  compiler_flag: "-fstack-protector"
+  linker_flag: "-Wl,-z,relro,-z,now"
+
+  linker_flag: "-no-canonical-prefixes"
+  linker_flag: "-pass-exit-codes"
+  linker_flag: "-Wl,--build-id=md5"
+  linker_flag: "-Wl,--hash-style=gnu"
+
+  compilation_mode_flags {
+    mode: DBG
+    compiler_flag: "-g"
+  }
+  compilation_mode_flags {
+    mode: OPT
+    # No debug symbols.
+    # Maybe we should enable https://gcc.gnu.org/wiki/DebugFission for opt or
+    # even generally? However, that can't happen here, as it requires special
+    # handling in Bazel.
+    compiler_flag: "-g0"
+    # Conservative choice for -O
+    # -O3 can increase binary size and even slow down the resulting binaries.
+    # Profile first and / or use FDO if you need better performance than this.
+    compiler_flag: "-O2"
+
+    # Disable assertions
+    compiler_flag: "-DNDEBUG"
+
+    # Removal of unused code and data at link time (can this increase binary size in some cases?).
+    compiler_flag: "-ffunction-sections"
+    compiler_flag: "-fdata-sections"
+    linker_flag: "-Wl,--gc-sections"
+  }
+  linking_mode_flags { mode: DYNAMIC }
+}
+
+toolchain {
+  abi_version: "local"
+  abi_libc_version: "local"
+  builtin_sysroot: ""
+  compiler: "compiler"
+  host_system_name: "local"
+  needsPic: true
+  supports_gold_linker: false
+  supports_incremental_linker: false
+  supports_fission: false
+  supports_interface_shared_objects: false
+  supports_normalizing_ar: false
+  supports_start_end_lib: false
+  target_libc: "local"
+  target_cpu: "local"
+  target_system_name: "local"
+  toolchain_identifier: "local_linux"
+
+  tool_path { name: "ar" path: "/usr/bin/ar" }
+  tool_path { name: "compat-ld" path: "/usr/bin/ld" }
+  tool_path { name: "cpp" path: "/usr/bin/cpp" }
+  tool_path { name: "dwp" path: "/usr/bin/dwp" }
+  tool_path { name: "gcc" path: "/usr/bin/gcc" }
+  cxx_flag: "-std=c++0x"
+  linker_flag: "-lstdc++"
+  linker_flag: "-B/usr/bin/"
+
+  # TODO(bazel-team): In theory, the path here ought to exactly match the path
+  # used by gcc. That works because bazel currently doesn't track files at
+  # absolute locations and has no remote execution, yet. However, this will need
+  # to be fixed, maybe with auto-detection?
+  cxx_builtin_include_directory: "/usr/lib/gcc/"
+  cxx_builtin_include_directory: "/usr/local/include"
+  cxx_builtin_include_directory: "/usr/include"
+  tool_path { name: "gcov" path: "/usr/bin/gcov" }
+
+  # C(++) compiles invoke the compiler (as that is the one knowing where
+  # to find libraries), but we provide LD so other rules can invoke the linker.
+  tool_path { name: "ld" path: "/usr/bin/ld" }
+
+  tool_path { name: "nm" path: "/usr/bin/nm" }
+  tool_path { name: "objcopy" path: "/usr/bin/objcopy" }
+  objcopy_embed_flag: "-I"
+  objcopy_embed_flag: "binary"
+  tool_path { name: "objdump" path: "/usr/bin/objdump" }
+  tool_path { name: "strip" path: "/usr/bin/strip" }
+
+  # Anticipated future default.
+  unfiltered_cxx_flag: "-no-canonical-prefixes"
+  unfiltered_cxx_flag: "-fno-canonical-system-headers"
+
+  # Make C++ compilation deterministic. Use linkstamping instead of these
+  # compiler symbols.
+  unfiltered_cxx_flag: "-Wno-builtin-macro-redefined"
+  unfiltered_cxx_flag: "-D__DATE__=\"redacted\""
+  unfiltered_cxx_flag: "-D__TIMESTAMP__=\"redacted\""
+  unfiltered_cxx_flag: "-D__TIME__=\"redacted\""
+
+  # Security hardening on by default.
+  # Conservative choice; -D_FORTIFY_SOURCE=2 may be unsafe in some cases.
+  # We need to undef it before redefining it as some distributions now have
+  # it enabled by default.
+  compiler_flag: "-U_FORTIFY_SOURCE"
+  compiler_flag: "-D_FORTIFY_SOURCE=1"
+  compiler_flag: "-fstack-protector"
+  linker_flag: "-Wl,-z,relro,-z,now"
+
+  # Enable coloring even if there's no attached terminal. Bazel removes the
+  # escape sequences if --nocolor is specified. This isn't supported by gcc
+  # on Ubuntu 14.04.
+  # compiler_flag: "-fcolor-diagnostics"
+
+  # All warnings are enabled. Maybe enable -Werror as well?
+  compiler_flag: "-Wall"
+  # Enable a few more warnings that aren't part of -Wall.
+  compiler_flag: "-Wunused-but-set-parameter"
+  # But disable some that are problematic.
+  compiler_flag: "-Wno-free-nonheap-object" # has false positives
+
+  # Keep stack frames for debugging, even in opt mode.
+  compiler_flag: "-fno-omit-frame-pointer"
+
+  # Anticipated future default.
+  linker_flag: "-no-canonical-prefixes"
+  # Have gcc return the exit code from ld.
+  linker_flag: "-pass-exit-codes"
+  # Stamp the binary with a unique identifier.
+  linker_flag: "-Wl,--build-id=md5"
+  linker_flag: "-Wl,--hash-style=gnu"
+  # Gold linker only? Can we enable this by default?
+  # linker_flag: "-Wl,--warn-execstack"
+  # linker_flag: "-Wl,--detect-odr-violations"
+
+  compilation_mode_flags {
+    mode: DBG
+    # Enable debug symbols.
+    compiler_flag: "-g"
+  }
+  compilation_mode_flags {
+    mode: OPT
+
+    # No debug symbols.
+    # Maybe we should enable https://gcc.gnu.org/wiki/DebugFission for opt or
+    # even generally? However, that can't happen here, as it requires special
+    # handling in Bazel.
+    compiler_flag: "-g0"
+
+    # Conservative choice for -O
+    # -O3 can increase binary size and even slow down the resulting binaries.
+    # Profile first and / or use FDO if you need better performance than this.
+    compiler_flag: "-O2"
+
+    # Disable assertions
+    compiler_flag: "-DNDEBUG"
+
+    # Removal of unused code and data at link time (can this increase binary size in some cases?).
+    compiler_flag: "-ffunction-sections"
+    compiler_flag: "-fdata-sections"
+    linker_flag: "-Wl,--gc-sections"
+  }
+  linking_mode_flags { mode: DYNAMIC }
+}
+
+toolchain {
+  abi_version: "local"
+  abi_libc_version: "local"
+  builtin_sysroot: ""
+  compiler: "compiler"
+  host_system_name: "local"
+  needsPic: true
+  target_libc: "macosx"
+  target_cpu: "darwin"
+  target_system_name: "local"
+  toolchain_identifier: "local_darwin"
+
+  tool_path { name: "ar" path: "/usr/bin/libtool" }
+  tool_path { name: "compat-ld" path: "/usr/bin/ld" }
+  tool_path { name: "cpp" path: "/usr/bin/cpp" }
+  tool_path { name: "dwp" path: "/usr/bin/dwp" }
+  tool_path { name: "gcc" path: "osx_cc_wrapper.sh" }
+  cxx_flag: "-std=c++0x"
+  ar_flag: "-static"
+  ar_flag: "-s"
+  ar_flag: "-o"
+  linker_flag: "-lstdc++"
+  linker_flag: "-undefined"
+  linker_flag: "dynamic_lookup"
+  linker_flag: "-headerpad_max_install_names"
+  # TODO(ulfjack): This is wrong on so many levels. Figure out a way to auto-detect the proper
+  # setting from the local compiler, and also how to make incremental builds correct.
+  cxx_builtin_include_directory: "/"
+  tool_path { name: "gcov" path: "/usr/bin/gcov" }
+  tool_path { name: "ld" path: "/usr/bin/ld" }
+  tool_path { name: "nm" path: "/usr/bin/nm" }
+  tool_path { name: "objcopy" path: "/usr/bin/objcopy" }
+  objcopy_embed_flag: "-I"
+  objcopy_embed_flag: "binary"
+  tool_path { name: "objdump" path: "/usr/bin/objdump" }
+  tool_path { name: "strip" path: "/usr/bin/strip" }
+
+  # Anticipated future default.
+  unfiltered_cxx_flag: "-no-canonical-prefixes"
+
+  # Make C++ compilation deterministic. Use linkstamping instead of these
+  # compiler symbols.
+  unfiltered_cxx_flag: "-Wno-builtin-macro-redefined"
+  unfiltered_cxx_flag: "-D__DATE__=\"redacted\""
+  unfiltered_cxx_flag: "-D__TIMESTAMP__=\"redacted\""
+  unfiltered_cxx_flag: "-D__TIME__=\"redacted\""
+
+  # Security hardening on by default.
+  # Conservative choice; -D_FORTIFY_SOURCE=2 may be unsafe in some cases.
+  compiler_flag: "-D_FORTIFY_SOURCE=1"
+  compiler_flag: "-fstack-protector"
+
+  # Enable coloring even if there's no attached terminal. Bazel removes the
+  # escape sequences if --nocolor is specified.
+  compiler_flag: "-fcolor-diagnostics"
+
+  # All warnings are enabled. Maybe enable -Werror as well?
+  compiler_flag: "-Wall"
+  # Enable a few more warnings that aren't part of -Wall.
+  compiler_flag: "-Wthread-safety"
+  compiler_flag: "-Wself-assign"
+
+  # Keep stack frames for debugging, even in opt mode.
+  compiler_flag: "-fno-omit-frame-pointer"
+
+  # Anticipated future default.
+  linker_flag: "-no-canonical-prefixes"
+
+  compilation_mode_flags {
+    mode: DBG
+    # Enable debug symbols.
+    compiler_flag: "-g"
+  }
+  compilation_mode_flags {
+    mode: OPT
+    # No debug symbols.
+    # Maybe we should enable https://gcc.gnu.org/wiki/DebugFission for opt or even generally?
+    # However, that can't happen here, as it requires special handling in Bazel.
+    compiler_flag: "-g0"
+
+    # Conservative choice for -O
+    # -O3 can increase binary size and even slow down the resulting binaries.
+    # Profile first and / or use FDO if you need better performance than this.
+    compiler_flag: "-O2"
+
+    # Disable assertions
+    compiler_flag: "-DNDEBUG"
+
+    # Removal of unused code and data at link time (can this increase binary size in some cases?).
+    compiler_flag: "-ffunction-sections"
+    compiler_flag: "-fdata-sections"
+  }
+  linking_mode_flags { mode: DYNAMIC }
+}
+
+toolchain {
+  abi_version: "local"
+  abi_libc_version: "local"
+  builtin_sysroot: ""
+  compiler: "compiler"
+  host_system_name: "local"
+  needsPic: true
+  supports_gold_linker: false
+  supports_incremental_linker: false
+  supports_fission: false
+  supports_interface_shared_objects: false
+  supports_normalizing_ar: false
+  supports_start_end_lib: false
+  target_libc: "local"
+  target_cpu: "freebsd"
+  target_system_name: "local"
+  toolchain_identifier: "local_freebsd"
+
+  tool_path { name: "ar" path: "/usr/bin/ar" }
+  tool_path { name: "compat-ld" path: "/usr/bin/ld" }
+  tool_path { name: "cpp" path: "/usr/bin/cpp" }
+  tool_path { name: "dwp" path: "/usr/bin/dwp" }
+  tool_path { name: "gcc" path: "/usr/bin/clang" }
+  cxx_flag: "-std=c++0x"
+  linker_flag: "-lstdc++"
+  linker_flag: "-B/usr/bin/"
+
+  # TODO(bazel-team): In theory, the path here ought to exactly match the path
+  # used by gcc. That works because bazel currently doesn't track files at
+  # absolute locations and has no remote execution, yet. However, this will need
+  # to be fixed, maybe with auto-detection?
+  cxx_builtin_include_directory: "/usr/lib/clang"
+  cxx_builtin_include_directory: "/usr/local/include"
+  cxx_builtin_include_directory: "/usr/include"
+  tool_path { name: "gcov" path: "/usr/bin/gcov" }
+
+  # C(++) compiles invoke the compiler (as that is the one knowing where
+  # to find libraries), but we provide LD so other rules can invoke the linker.
+  tool_path { name: "ld" path: "/usr/bin/ld" }
+
+  tool_path { name: "nm" path: "/usr/bin/nm" }
+  tool_path { name: "objcopy" path: "/usr/bin/objcopy" }
+  objcopy_embed_flag: "-I"
+  objcopy_embed_flag: "binary"
+  tool_path { name: "objdump" path: "/usr/bin/objdump" }
+  tool_path { name: "strip" path: "/usr/bin/strip" }
+
+  # Anticipated future default.
+  unfiltered_cxx_flag: "-no-canonical-prefixes"
+
+  # Make C++ compilation deterministic. Use linkstamping instead of these
+  # compiler symbols.
+  unfiltered_cxx_flag: "-Wno-builtin-macro-redefined"
+  unfiltered_cxx_flag: "-D__DATE__=\"redacted\""
+  unfiltered_cxx_flag: "-D__TIMESTAMP__=\"redacted\""
+  unfiltered_cxx_flag: "-D__TIME__=\"redacted\""
+
+  # Security hardening on by default.
+  # Conservative choice; -D_FORTIFY_SOURCE=2 may be unsafe in some cases.
+  # We need to undef it before redefining it as some distributions now have
+  # it enabled by default.
+  compiler_flag: "-U_FORTIFY_SOURCE"
+  compiler_flag: "-D_FORTIFY_SOURCE=1"
+  compiler_flag: "-fstack-protector"
+  linker_flag: "-Wl,-z,relro,-z,now"
+
+  # Enable coloring even if there's no attached terminal. Bazel removes the
+  # escape sequences if --nocolor is specified. This isn't supported by gcc
+  # on Ubuntu 14.04.
+  # compiler_flag: "-fcolor-diagnostics"
+
+  # All warnings are enabled. Maybe enable -Werror as well?
+  compiler_flag: "-Wall"
+  # Enable a few more warnings that aren't part of -Wall.
+  #compiler_flag: "-Wunused-but-set-parameter"
+  # But disable some that are problematic.
+  #compiler_flag: "-Wno-free-nonheap-object" # has false positives
+
+  # Keep stack frames for debugging, even in opt mode.
+  compiler_flag: "-fno-omit-frame-pointer"
+
+  # Anticipated future default.
+  linker_flag: "-no-canonical-prefixes"
+  # Have gcc return the exit code from ld.
+  #linker_flag: "-pass-exit-codes"
+  # Stamp the binary with a unique identifier.
+  #linker_flag: "-Wl,--build-id=md5"
+  linker_flag: "-Wl,--hash-style=gnu"
+  # Gold linker only? Can we enable this by default?
+  # linker_flag: "-Wl,--warn-execstack"
+  # linker_flag: "-Wl,--detect-odr-violations"
+
+  compilation_mode_flags {
+    mode: DBG
+    # Enable debug symbols.
+    compiler_flag: "-g"
+  }
+  compilation_mode_flags {
+    mode: OPT
+
+    # No debug symbols.
+    # Maybe we should enable https://gcc.gnu.org/wiki/DebugFission for opt or
+    # even generally? However, that can't happen here, as it requires special
+    # handling in Bazel.
+    compiler_flag: "-g0"
+
+    # Conservative choice for -O
+    # -O3 can increase binary size and even slow down the resulting binaries.
+    # Profile first and / or use FDO if you need better performance than this.
+    compiler_flag: "-O2"
+
+    # Disable assertions
+    compiler_flag: "-DNDEBUG"
+
+    # Removal of unused code and data at link time (can this increase binary size in some cases?).
+    compiler_flag: "-ffunction-sections"
+    compiler_flag: "-fdata-sections"
+    linker_flag: "-Wl,--gc-sections"
+  }
+  linking_mode_flags { mode: DYNAMIC }
+}
+
+toolchain {
+  abi_version: "local"
+  abi_libc_version: "local"
+  builtin_sysroot: ""
+  compiler: "windows_mingw"
+  host_system_name: "local"
+  needsPic: false
+  target_libc: "local"
+  target_cpu: "x64_windows"
+  target_system_name: "local"
+  toolchain_identifier: "local_windows_mingw"
+
+  tool_path { name: "ar" path: "C:/mingw/bin/ar" }
+  tool_path { name: "compat-ld" path: "C:/mingw/bin/ld" }
+  tool_path { name: "cpp" path: "C:/mingw/bin/cpp" }
+  tool_path { name: "dwp" path: "C:/mingw/bin/dwp" }
+  tool_path { name: "gcc" path: "C:/mingw/bin/gcc" }
+  cxx_flag: "-std=c++0x"
+  # TODO(bazel-team): In theory, the path here ought to exactly match the path
+  # used by gcc. That works because bazel currently doesn't track files at
+  # absolute locations and has no remote execution, yet. However, this will need
+  # to be fixed, maybe with auto-detection?
+  cxx_builtin_include_directory: "C:/mingw/include"
+  cxx_builtin_include_directory: "C:/mingw/lib/gcc"
+  tool_path { name: "gcov" path: "C:/mingw/bin/gcov" }
+  tool_path { name: "ld" path: "C:/mingw/bin/ld" }
+  tool_path { name: "nm" path: "C:/mingw/bin/nm" }
+  tool_path { name: "objcopy" path: "C:/mingw/bin/objcopy" }
+  objcopy_embed_flag: "-I"
+  objcopy_embed_flag: "binary"
+  tool_path { name: "objdump" path: "C:/mingw/bin/objdump" }
+  tool_path { name: "strip" path: "C:/mingw/bin/strip" }
+  linking_mode_flags { mode: DYNAMIC }
+}
+
+toolchain {
+  abi_version: "local"
+  abi_libc_version: "local"
+  builtin_sysroot: ""
+  compiler: "windows_msys64_mingw64"
+  host_system_name: "local"
+  needsPic: false
+  target_libc: "local"
+  target_cpu: "x64_windows"
+  target_system_name: "local"
+  toolchain_identifier: "local_windows_msys64_mingw64"
+
+  tool_path { name: "ar" path: "C:/tools/msys64/mingw64/bin/ar" }
+  tool_path { name: "compat-ld" path: "C:/tools/msys64/mingw64/bin/ld" }
+  tool_path { name: "cpp" path: "C:/tools/msys64/mingw64/bin/cpp" }
+  tool_path { name: "dwp" path: "C:/tools/msys64/mingw64/bin/dwp" }
+  tool_path { name: "gcc" path: "C:/tools/msys64/mingw64/bin/gcc" }
+  cxx_flag: "-std=c++0x"
+  # TODO(bazel-team): In theory, the path here ought to exactly match the path
+  # used by gcc. That works because bazel currently doesn't track files at
+  # absolute locations and has no remote execution, yet. However, this will need
+  # to be fixed, maybe with auto-detection?
+  cxx_builtin_include_directory: "C:/tools/msys64/mingw64/x86_64-w64-mingw32/include"
+  tool_path { name: "gcov" path: "C:/tools/msys64/mingw64/bin/gcov" }
+  tool_path { name: "ld" path: "C:/tools/msys64/mingw64/bin/ld" }
+  tool_path { name: "nm" path: "C:/tools/msys64/mingw64/bin/nm" }
+  tool_path { name: "objcopy" path: "C:/tools/msys64/mingw64/bin/objcopy" }
+  objcopy_embed_flag: "-I"
+  objcopy_embed_flag: "binary"
+  tool_path { name: "objdump" path: "C:/tools/msys64/mingw64/bin/objdump" }
+  tool_path { name: "strip" path: "C:/tools/msys64/mingw64/bin/strip" }
+  linking_mode_flags { mode: DYNAMIC }
+}
+
+toolchain {
+  abi_version: "local"
+  abi_libc_version: "local"
+  builtin_sysroot: ""
+  compiler: "windows_clang"
+  host_system_name: "local"
+  needsPic: false
+  target_libc: "local"
+  target_cpu: "x64_windows"
+  target_system_name: "local"
+  toolchain_identifier: "local_windows_clang"
+
+  tool_path { name: "ar" path: "C:/mingw/bin/ar" }
+  tool_path { name: "compat-ld" path: "C:/Program Files (x86)/LLVM/bin/ld" }
+  tool_path { name: "cpp" path: "C:/Program Files (x86)/LLVM/bin/cpp" }
+  tool_path { name: "dwp" path: "C:/Program Files (x86)/LLVM/bin/dwp" }
+  tool_path { name: "gcc" path: "C:/Program Files (x86)/LLVM/bin/clang" }
+  cxx_flag: "-std=c++0x"
+  # TODO(bazel-team): In theory, the path here ought to exactly match the path
+  # used by gcc. That works because bazel currently doesn't track files at
+  # absolute locations and has no remote execution, yet. However, this will need
+  # to be fixed, maybe with auto-detection?
+  cxx_builtin_include_directory: "/usr/lib/gcc/"
+  cxx_builtin_include_directory: "/usr/local/include"
+  cxx_builtin_include_directory: "/usr/include"
+  tool_path { name: "gcov" path: "C:/Program Files (x86)/LLVM/bin/gcov" }
+  tool_path { name: "ld" path: "C:/Program Files (x86)/LLVM/bin/ld" }
+  tool_path { name: "nm" path: "C:/Program Files (x86)/LLVM/bin/nm" }
+  tool_path { name: "objcopy" path: "C:/Program Files (x86)/LLVM/bin/objcopy" }
+  objcopy_embed_flag: "-I"
+  objcopy_embed_flag: "binary"
+  tool_path { name: "objdump" path: "C:/Program Files (x86)/LLVM/bin/objdump" }
+  tool_path { name: "strip" path: "C:/Program Files (x86)/LLVM/bin/strip" }
+  linking_mode_flags { mode: DYNAMIC }
+}
+
+toolchain {
+   abi_version: "local"
+   abi_libc_version: "local"
+   builtin_sysroot: ""
+   compiler: "windows_msys64"
+   host_system_name: "local"
+   needsPic: false
+   target_libc: "local"
+   target_cpu: "x64_windows"
+   target_system_name: "local"
+   toolchain_identifier: "local_windows_msys64"
+
+   tool_path { name: "ar" path: "C:/tools/msys64/usr/bin/ar" }
+   tool_path { name: "compat-ld" path: "C:/tools/msys64/usr/bin/ld" }
+   tool_path { name: "cpp" path: "C:/tools/msys64/usr/bin/cpp" }
+   tool_path { name: "dwp" path: "C:/tools/msys64/usr/bin/dwp" }
+   # Use gcc instead of g++ so that C will compile correctly.
+   tool_path { name: "gcc" path: "C:/tools/msys64/usr/bin/gcc" }
+   cxx_flag: "-std=gnu++0x"
+   linker_flag: "-lstdc++"
+   # TODO(bazel-team): In theory, the path here ought to exactly match the path
+   # used by gcc. That works because bazel currently doesn't track files at
+   # absolute locations and has no remote execution, yet. However, this will need
+   # to be fixed, maybe with auto-detection?
+   cxx_builtin_include_directory: "C:/tools/msys64/"
+   cxx_builtin_include_directory: "/usr/"
+   tool_path { name: "gcov" path: "C:/tools/msys64/usr/bin/gcov" }
+   tool_path { name: "ld" path: "C:/tools/msys64/usr/bin/ld" }
+   tool_path { name: "nm" path: "C:/tools/msys64/usr/bin/nm" }
+   tool_path { name: "objcopy" path: "C:/tools/msys64/usr/bin/objcopy" }
+   objcopy_embed_flag: "-I"
+   objcopy_embed_flag: "binary"
+   tool_path { name: "objdump" path: "C:/tools/msys64/usr/bin/objdump" }
+   tool_path { name: "strip" path: "C:/tools/msys64/usr/bin/strip" }
+   linking_mode_flags { mode: DYNAMIC }
+}
+
+toolchain {
+  toolchain_identifier: "vc_14_0_x64"
+  host_system_name: "local"
+  target_system_name: "local"
+
+  abi_version: "local"
+  abi_libc_version: "local"
+  target_cpu: "x64_windows_msvc"
+  compiler: "cl"
+  target_libc: "msvcrt140"
+  default_python_version: "python2.7"
+  cxx_builtin_include_directory: "C:/Program Files (x86)/Microsoft Visual Studio 14.0/VC/INCLUDE"
+  cxx_builtin_include_directory: "C:/Program Files (x86)/Windows Kits/10/include/"
+  cxx_builtin_include_directory: "C:/Program Files (x86)/Windows Kits/8.1/include/"
+  cxx_builtin_include_directory: "C:/Program Files (x86)/GnuWin32/include/"
+  cxx_builtin_include_directory: "C:/python_27_amd64/files/include"
+  tool_path {
+    name: "ar"
+    path: "wrapper/bin/msvc_link.bat"
+  }
+  tool_path {
+    name: "cpp"
+    path: "wrapper/bin/msvc_cl.bat"
+  }
+  tool_path {
+    name: "gcc"
+    path: "wrapper/bin/msvc_cl.bat"
+  }
+  tool_path {
+    name: "gcov"
+    path: "wrapper/bin/msvc_nop.bat"
+  }
+  tool_path {
+    name: "ld"
+    path: "wrapper/bin/msvc_link.bat"
+  }
+  tool_path {
+    name: "nm"
+    path: "wrapper/bin/msvc_nop.bat"
+  }
+  tool_path {
+    name: "objcopy"
+    path: "wrapper/bin/msvc_nop.bat"
+  }
+  tool_path {
+    name: "objdump"
+    path: "wrapper/bin/msvc_nop.bat"
+  }
+  tool_path {
+    name: "strip"
+    path: "wrapper/bin/msvc_nop.bat"
+  }
+  supports_gold_linker: false
+  supports_start_end_lib: false
+  supports_interface_shared_objects: false
+  supports_incremental_linker: false
+  supports_normalizing_ar: true
+  needsPic: false
+
+  compiler_flag: "-m64"
+  compiler_flag: "/D__inline__=__inline"
+  # TODO(pcloudy): Review those flags below, they should be defined by cl.exe
+  compiler_flag: "/DOS_WINDOWS=OS_WINDOWS"
+  compiler_flag: "/DCOMPILER_MSVC"
+
+  # Don't pollute with GDI macros in windows.h.
+  compiler_flag: "/DNOGDI"
+  # Don't define min/max macros in windows.h.
+  compiler_flag: "/DNOMINMAX"
+  compiler_flag: "/DPRAGMA_SUPPORTED"
+  # Platform defines.
+  compiler_flag: "/D_WIN32_WINNT=0x0600"
+  # Turn off warning messages.
+  compiler_flag: "/D_CRT_SECURE_NO_DEPRECATE"
+  compiler_flag: "/D_CRT_SECURE_NO_WARNINGS"
+  compiler_flag: "/D_SILENCE_STDEXT_HASH_DEPRECATION_WARNINGS"
+  # Use math constants (M_PI, etc.) from the math library
+  compiler_flag: "/D_USE_MATH_DEFINES"
+
+  # Useful options to have on for compilation.
+  # Suppress startup banner.
+  compiler_flag: "/nologo"
+  # Increase the capacity of object files to 2^32 sections.
+  compiler_flag: "/bigobj"
+  # Allocate 500MB for precomputed headers.
+  compiler_flag: "/Zm500"
+  # Use unsigned char by default.
+  compiler_flag: "/J"
+  # Use function level linking.
+  compiler_flag: "/Gy"
+  # Use string pooling.
+  compiler_flag: "/GF"
+  # Warning level 3 (could possibly go to 4 in the future).
+  compiler_flag: "/W3"
+  # Catch both asynchronous (structured) and synchronous (C++) exceptions.
+  compiler_flag: "/EHsc"
+
+  # Globally disabled warnings.
+  # Don't warn about elements of array being be default initialized.
+  compiler_flag: "/wd4351"
+  # Don't warn about no matching delete found.
+  compiler_flag: "/wd4291"
+  # Don't warn about diamond inheritance patterns.
+  compiler_flag: "/wd4250"
+  # Don't warn about insecure functions (e.g. non _s functions).
+  compiler_flag: "/wd4996"
+
+  linker_flag: "-m64"
+
+  feature {
+    name: 'include_paths'
+    flag_set {
+      action: 'preprocess-assemble'
+      action: 'c-compile'
+      action: 'c++-compile'
+      action: 'c++-header-parsing'
+      action: 'c++-header-preprocessing'
+      action: 'c++-module-compile'
+      flag_group {
+        flag: '/I%{quote_include_paths}'
+      }
+      flag_group {
+        flag: '/I%{include_paths}'
+      }
+      flag_group {
+        flag: '/I%{system_include_paths}'
+      }
+    }
+  }
+
+  feature {
+    name: 'dependency_file'
+    flag_set {
+      action: 'assemble'
+      action: 'preprocess-assemble'
+      action: 'c-compile'
+      action: 'c++-compile'
+      action: 'c++-module-compile'
+      action: 'c++-header-preprocessing'
+      action: 'c++-header-parsing'
+      expand_if_all_available: 'dependency_file'
+      flag_group {
+        flag: '/DEPENDENCY_FILE'
+        flag: '%{dependency_file}'
+      }
+    }
+  }
+
+  # Stop passing -frandom-seed option
+  feature {
+    name: 'random_seed'
+  }
+
+  # This feature is just for enabling flag_set in action_config for -c and -o options during the transitional period
+  feature {
+    name: 'compile_action_flags_in_flag_set'
+  }
+
+  action_config {
+    config_name: 'c-compile'
+    action_name: 'c-compile'
+    tool {
+      tool_path: 'wrapper/bin/msvc_cl.bat'
+    }
+    flag_set {
+      flag_group {
+        flag: '/c'
+        flag: '%{source_file}'
+      }
+    }
+    flag_set {
+      expand_if_all_available: 'output_object_file'
+      flag_group {
+        flag: '/Fo%{output_object_file}'
+      }
+    }
+    flag_set {
+      expand_if_all_available: 'output_assembly_file'
+      flag_group {
+        flag: '/Fa%{output_assembly_file}'
+      }
+    }
+    flag_set {
+      expand_if_all_available: 'output_preprocess_file'
+      flag_group {
+        flag: '/P'
+        flag: '/Fi%{output_preprocess_file}'
+      }
+    }
+  }
+  action_config {
+    config_name: 'c++-compile'
+    action_name: 'c++-compile'
+    tool {
+      tool_path: 'wrapper/bin/msvc_cl.bat'
+    }
+
+    flag_set {
+      flag_group {
+        flag: '/c'
+        flag: '%{source_file}'
+      }
+    }
+
+    flag_set {
+      expand_if_all_available: 'output_object_file'
+      flag_group {
+        flag: '/Fo%{output_object_file}'
+      }
+    }
+
+    flag_set {
+      expand_if_all_available: 'output_assembly_file'
+      flag_group {
+        flag: '/Fa%{output_assembly_file}'
+      }
+    }
+
+    flag_set {
+      expand_if_all_available: 'output_preprocess_file'
+      flag_group {
+        flag: '/P'
+        flag: '/Fi%{output_preprocess_file}'
+      }
+    }
+  }
+
+  compilation_mode_flags {
+    mode: DBG
+    compiler_flag: "/DDEBUG=1"
+    compiler_flag: "-g"
+    compiler_flag: "/Od"
+    compiler_flag: "-Xcompilation-mode=dbg"
+  }
+
+  compilation_mode_flags {
+    mode: FASTBUILD
+    compiler_flag: "/DNDEBUG"
+    compiler_flag: "/Od"
+    compiler_flag: "-Xcompilation-mode=fastbuild"
+  }
+
+  compilation_mode_flags {
+    mode: OPT
+    compiler_flag: "/DNDEBUG"
+    compiler_flag: "/O2"
+    compiler_flag: "-Xcompilation-mode=opt"
+  }
+}
EOF
}
